Series – Railway Reasoning part – 13

Total Questions: 50

1. B8, H27, N64, T125,? [RRB NTPC 26/07/2021 (Evening)]

Correct Answer: (d) Z216
Solution:

B + 6 = H, H + 6 = N, N + 6 = T, T + 6 = Z
Numbers are cubes of consecutive numbers. Next will be Z 216

2. RAA, ?, PCB, ODB, NEC,MFC [RRB NTPC 26/07/2021 (Evening)]

Correct Answer: (b) QBA
Solution:

1st letter - 1 = 1st letter of next term
2nd letter + 1 = 2nd letter of the next
The 3rd letter remains the same in two terms then +1 for the next two terms.
Missing Term = R - 1 = Q, A + 1 = B , A = QBA

3. ACF, GIL, ?, SUX [RRB NTPC 26/07/2021 (Evening)]

Correct Answer: (b) MOR
Solution:

A + 6 = G, C + 6 = I, F + 6 = L
G + 6 = M, I + 6 = O, L + 6 = R = MOR

4. 789, 267, 93, ? [RRB NTPC 26/07/2021 (Evening)]

Correct Answer: (d) 35
Solution:

(789 + 12) ÷ 3 = 267
(267 + 12 ) ÷ 3 = 93
(93 + 12 ) ÷ 3 = 35

5. 2, 7, 23, ?, 220, 665 [RRB NTPC 31/07/2021 (Morning)]

Correct Answer: (b) 72
Solution:

Logic :
2 × 3 + 1 = 7
7 × 3 + 2 = 23
23 × 3 + 3 = 69 + 3 = 72
72 × 3 + 4 = 220
220 × 3 + 5 = 665

6. 3d16, 6e14, 9f12, 12g10, 15h8,? [RRB NTPC 31/07/2021 (Morning)]

Correct Answer: (a) 18i6
Solution:

3 + 3 = 6 , 6 + 3 = 9 , 9 + 3 = 12 , 12 + 3 = 15 , 15 + 3 = 18
d +1 = e , e +1 = f , f +1 = g , g +1 = h , h +1 = i
16 - 2 = 14 , 14 -2 = 12 , 12 -2 = 10 , 10 - 2 = 8 , 8 -2 = 6

7. ADGJ, CFIL, ? , GJMP [RRB NTPC 31/07/2021 (Morning)]

Correct Answer: (d) EHKN
Solution:

A + 2 = C , C + 2 = E , E + 2 = G
D + 2 = F , F + 2 = H , H + 2 = J
G + 2 = I , I + 2 = K , K + 2 = M
J + 2 = L , L + 2 = N , N + 2 = P

8. 3A2, 8G7,18M14, 33S23, 53Y34, ? [RRB NTPC 31/07/2021 (Evening)]

Correct Answer: (b) 78E47
Solution:

Logic :- 3 + 5 = 8, 8 + 10 = 18, 18 + 15 = 33, 33 + 20 = 53
A + 6 = G, G + 6 = M, M + 6 = S, S + 6 = Y
2 + 5 = 7, 7 + 7 = 14, 14 + 9 = 23, 23 + 11 = 34
Next term : - 53 + 25 = 78, Y + 6 = E, 34 + 13 = 47 ⇒ 78E47

9. 541, 629, 552, 618, ? [RRB NTPC 31/07/2021 (Evening)]

Correct Answer: (c) 563
Solution:

10. D2Z, F7X, C22V, E67T,? [RRB NTPC 31/07/2021 (Evening)]

Correct Answer: (c) B202R
Solution:

D + 2= F, F - 3 = C, C + 2 = E, E - 3 = B
2 + 5 = 7, 7 + 15 = 22, 22 + 45 = 67, 67 + 135 = 202
Z - 2 = X, X - 2 = V, V - 2 = T, T - 2 = R
Next term will be = B202R